KABUL — Marine General Joseph F. Dunford, a Boston native, took command of both the US and the international military missions in Afghanistan in a traditional handoff ceremony on Sunday, becoming the 15th general to lead the international command here — and he is expected to be its last.

It falls to Dunford, who led the Fifth Marine Regiment at the start of the Iraq War, to manage the withdrawal of nearly 100,000 troops, about 68,000 of them American, and a vast amount of equipment and cargo from a landlocked country still at war with the Taliban.